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Question
Fill in the blank:
A radical with one atom of sulphur and three atoms of oxygen are __________.
Solution
A radical with one atom of sulphur and three atoms of oxygen is sulphite.
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Name the following radicals :
SO42
A liquid compound X of molecular mass 18 u can be obtained from a number of natural sources. All the animals and plants need liquid X for their survival. When an electric current is passed through 200 grams of pure liquid X under suitable conditions, then 178 grams of gas Y and 22 grams of gas Z are produced. Gas Y is produced at the positive electrode whereas gas Z is obtained at the negative electrode. Moreover, gas Y supports combustion whereas gas Z burns itself causing explosions.
- Name (i) liquid X (ii) gas Y, and (iii) gas Z.
- What is the ratio of the mass of element Z to the mass of element Y in the liquid X ?
- Which law of chemical combination is illustrated by this example ?
- Name two sources of liquid X.
- State an important use of Y in our life.
Fill in the following blank with suitable word :
The particle which is formed by the gain of electrons by an atom is called ..............
Fill in the following blank with suitable word:
The particle which is formed by the loss of electrons by an atom is called..............
The valencies (or charges) of some of the ions are given below :
Ion Valency Ion Valency (Charge) (Charge)
Sodium ion 1+ Nitrate ion 1–
Copper ion 2+ Sulphide ion 2–
Using this information, write down the formulae of :
- Sodium sulphide
- Copper nitrate
What is an ion ? How is an ion formed ? Explain with the help of two examples of different ions.
Write symbols of the following elements and the radicals obtained from them and indicate the charge on the radicals.
Mercury, potassium, nitrogen, copper, sulphur, carbon, chlorine, oxygen
Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compound.
Calcium silicate
Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compound.
Sodium thiosulphate
State if the following element or radical is divalent?
Ammonium
